What should a driver do when they cannot see persons and vehicles 150m in front of them?

When a driver cannot see persons and vehicles 150 meters ahead, switching on the headlights is the correct action because it enhances visibility for both the driver and others on the road. Using headlights in low visibility conditions, such as at night or in adverse weather, helps illuminate the road and makes the vehicle more visible to other road users. This is crucial for safety, as it reduces the risk of accidents caused by a lack of awareness of surrounding hazards.

In low visibility conditions, relying solely on natural light is not advisable, as it can lead to dangerous situations. The other actions, such as speeding up to pass quickly or driving cautiously without headlights, do not adequately address the visibility issue and can lead to greater risks on the road. Pulling over and waiting for visibility can be appropriate in some situations but is less proactive than using headlights to improve safety while continuing to drive responsibly.